40 quintillion stellar-mass black holes are lurking in the universe, new study finds

Scientists have estimated the number of "small" black holes in the universe. [...] So how did the scientists arrive at that number? By tracking the evolution of stars in our universe they estimated how often the stars - either on their own, or paired into binary systems - would transform into black holes, said first author Alex Sicilia, an astrophysicist at the International School of Advanced Studies (SISSA) in Trieste, Italy.

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